dt-bindings: clock: gpio-mux-clock: Convert to json-schema

Convert the simple GPIO clock multiplexer Device Tree binding
documentation to json-schema.

Signed-off-by: Geert Uytterhoeven <[e-mail]>
Link: https://lore.kernel.org/r/14cb3[e-mail]
Reviewed-by: Rob Herring <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/gpio-mux-clock.txt

···
-Binding for simple gpio clock multiplexer.
-
-This binding uses the common clock binding[1].
-
-[1] Documentation/devicetree/bindings/clock/clock-bindings.txt
-
-Required properties:
-- compatible : shall be "gpio-mux-clock".
-- clocks: list of two references to parent clocks.
-- #clock-cells : from common clock binding; shall be set to 0.
-- select-gpios : GPIO reference for selecting the parent clock.
-
-Example:
-	clock {
-		compatible = "gpio-mux-clock";
-		clocks = <&parentclk1>, <&parentclk2>;
-		#clock-cells = <0>;
-		select-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
-	};

Documentation/devicetree/bindings/clock/gpio-mux-clock.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/clock/gpio-mux-clock.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Simple GPIO clock multiplexer
+
+maintainers:
+  - Sergej Sawazki <[e-mail]>
+
+properties:
+  compatible:
+    const: gpio-mux-clock
+
+  clocks:
+    items:
+      - description: First parent clock
+      - description: Second parent clock
+
+  '#clock-cells':
+    const: 0
+
+  select-gpios:
+    description: GPIO reference for selecting the parent clock.
+    maxItems: 1
+
+required:
+  - compatible
+  - clocks
+  - '#clock-cells'
+  - select-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    clock {
+            compatible = "gpio-mux-clock";
+            clocks = <&parentclk1>, <&parentclk2>;
+            #clock-cells = <0>;
+            select-gpios = <&gpio 1 GPIO_ACTIVE_HIGH>;
+    };